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Be aware how your voice works. Have you ever pulled the open end of an air filled balloon tight and the air rushes out at a squeal like pitch, then the more you open the balloon, the quieter and lower the pitch gets. This is a literal representation of your vocal chords.
The vocal cords are quite good at putting out a strong signal if desired. A well-produced sound can carry information quite a distance. I can think of a baby in a church, my daughter screaming or an opera singer still heard clearly in the cheap, upper balcony seats. The vocal cords are quite talented at demonstrating emotion. Think about sighs, whines, giggles, laughs, growls and all the other sounds we make that are not words but strongly convey emotion. I can be digging in the garden when a small gust sets the wind chimes ringing.